The minimum system I have tested on for 1080p avg 60fps (with 64 bots) is equivalent to:
- 8GB RAM 1600mhz
- Intel 4th gen i3 or AMD fx6300
- Nvidia GTX 960 4GB or AMD R9 380 4GB
- 3GB disk space
Reducing the bot count in settings will give the most performance gains and be able to run on lower-spec PC's
Hope this helps :)